Drive for speed indicators



G. DEGERTH DE [VB FOR SPEED INDICATORS April 24, 1934.

' Fild M a rch '18, 195:5

patented Apr. 24, 1934 PATENT FFICE DRIVE FOR SPEED INDICATORS Application March 18, 1933, Serial No. 661,640 In Germany March 22, 1932 4 Claims.

In connection with revolving spindles, particularly when it concerns quickly revolving movable spindles of separators or the like, the spindle is often equipped with a screw or worm which catches into a screw or worm in the spindle of the speed indicator. In such a case the spindle, the speed of which is tobe measured, is placed in the frame of the machine independent of the spindle cf the speed indicator. From experience it is, however, known that the vibrations of these spindles are very often so considerable that the two gearing parts which should catch into each other (worm and worm wheel respectively, the two screw-wheels) do not come into contact or 1 at least may get apart so far that this will cause more or less serious trouble. By the present invention this disadvantage is to be dispensed with. For this purpose in accordance with the invention the speed indicator itself has been placed into the stationary frame of the spindle bearing, while the part for driving the speed indicator has been placed on the movable bearing of the spindle and is connected with the shaft of the speed indicator by one i. i. by itself known friction coupling.

The drawing shows by way of example a means of putting the invention into efieetz- Fig. 1 shows a section of the parts of a cream separator.

Fig. 2 shows a section through Fig. 1 in the 30 direction 2-2.

In the drawing a indicates the frame of the machine, I) the rotating part which is placed on a spindle c. The spindle c is arranged in a bearing 01 and the latter is movably placed in the frame i. c. it rests by means of a flange 6 on a portion of the frame and has some openings for the screws f screwed into the frame. By means of a spring g inserted between the neck-bearing and the frame the lateral vibrations of the bearing and L thus of the shaft are rendered possible. At a suitable place the shaft c is equipped with a worm or a screw it which catches into a worm or a corresponding screw wheel 1.

In accordance with the invention the lower part of the bearing :2 has a preferably horse-shoe formed extension is, the two legs of which are used as bearing for the spindle of the worm wheel or screw wheel 2'. On the shaft of the worm wheel i at the outside of the bearing in the part is a friction or coupling part m is arranged which catches into a corresponding coupling part n on the shaft of the speed indicator 0, in order to move same. The speed indicator itself has a transparent disc and is kept in position by a ring 10 fastened to the frame.

On account of the worm or screw wheel 2' being kept in the same bearing as the spindle c respectively the worm it these parts remain constantly in the same position to each other i. e. the worm wheel 2' follows the vibrations of the shaft 0 so that the contact between these two parts and an absolutely safe gripping of the tachometer shaft will be secured. Of course, the invention is also applicable, if the transmission of the revolution of the shaft 0 on the tachometer shaft is effected by other means f. i. a friction wheel gearing or such like; the bearing for the worm or screw 2' can also be a special part rigidly connected with the bearing (2.

I claim: 70

1. Drive for speed indicator for quickly revolving, movably arranged spindles, at which a gearing part fitted to the spindle catches into a gearing part on the driving shaft of the speed indicator, characterized thereby that the speed indicator itself (0) is placed into the stationary frame (a) of the spindle bearing, while the gearing part (i) for driving the speed indicator is arranged on the movable bearing (03) of the spindle and is connected with the shaft of the speed so indicator by a coupling f. i. an already known friction coupling (m, n)

2. The combination of a spindle, a resiliently mounted bearing in which the spindle is journaled, a tachometer operatively mounted with respect to said bearing for indicating the speed of the spindle, a driving member on said spindle, driving means between the driving member and said tachometer, and bearing means fixed on said first bearing operatively supporting said driving means.

3. The combination of a spindle, a resiliently mounted bearing in which the spindle is journaled, a driving gear on said spindle, a driven shaft having a gear meshing with said first gear, and bearing means fixed on said first bearing rotatably mounting said shaft.

4. The combination of a frame structure, a bearing resiliently mounted on said structure, a spindle journaled in said bearing, a tachometer for indicating the speed of said spindle, said tachometer being fixed on said structure, a gear on said spindle, driving means operatively interposing said gear and tachometer, said driving means consisting of a shaft and a gear on said shaft which meshes with said first gear, and bearing means fixed on said first bearing rotatably mounting said shaft.

JOHN GUSTAF DEGERTH. 

